ifeq ($(strip $(DEVKITPRO)),)
$(error "Please set DEVKITPRO in your environment. export DEVKITPRO=<path to>/devkitpro")
endif

# -----------------------------------------------

APP_TITLE         =
APP_AUTHOR        =
APP_ICON          =
APP_VERSION       =
APP_TITLEID       =

TARGET            =    $(notdir $(CURDIR))
EXTENSION         =    nro
OUT               =    out
BUILD             =    build
SOURCES           =    src
INCLUDES          =    include
CUSTOM_LIBS       =
ROMFS             =    res

DEFINES           =    __SWITCH__ DEBUG
ARCH              =    -march=armv8-a+crc+crypto+simd -mtune=cortex-a57 -mtp=soft -fpie
FLAGS             =    -Wall -pipe -g -O2 -ffunction-sections -fdata-sections
CFLAGS            =    -std=gnu11
CXXFLAGS          =    -std=gnu++17 -fno-rtti
ASFLAGS           =
LDFLAGS           =    -Wl,-pie -specs=$(DEVKITPRO)/libnx/switch.specs -g
LINKS             =    -lnx

PREFIX            =    aarch64-none-elf-
CC                =    $(PREFIX)gcc
CXX               =    $(PREFIX)g++
AS                =    $(PREFIX)as
LD                =    $(PREFIX)g++
NM                =    $(PREFIX)gcc-nm

# -----------------------------------------------

CFILES            =    $(shell find $(SOURCES) -name *.c)
CPPFILES          =    $(shell find $(SOURCES) -name *.cpp)
SFILES            =    $(shell find $(SOURCES) -name *.s -or -name *.S)
OFILES            =    $(CFILES:%=$(BUILD)/%.nx.o) $(CPPFILES:%=$(BUILD)/%.nx.o) $(SFILES:%=$(BUILD)/%.nx.o)
DFILES            =    $(OFILES:.o=.d)

NX_TARGET         =    $(if $(OUT:=), $(OUT)/$(TARGET).$(EXTENSION), .$(OUT)/$(TARGET).$(EXTENSION))
ELF_TARGET        =    $(if $(OUT:=), $(OUT)/$(TARGET)-nx.elf, .$(OUT)/$(TARGET)-nx.elf)
NACP_TARGET       =    $(if $(OUT:=), $(OUT)/$(TARGET).nacp, .$(OUT)/$(TARGET).nacp)
NRO_TARGET        =    $(if $(OUT:=), $(OUT)/$(TARGET).nro, .$(OUT)/$(TARGET).nro)

DEFINE_FLAGS      =    $(addprefix -D,$(DEFINES))
INCLUDE_FLAGS     =    $(addprefix -I,$(INCLUDES)) $(foreach dir,$(LIBS),-I$(dir)/include)
LIB_FLAGS         =    $(foreach dir,$(LIBS),-L$(dir)/lib)

# -----------------------------------------------

export PATH      :=    $(DEVKITPRO)/tools/bin:$(DEVKITPRO)/devkitA64/bin:$(PORTLIBS)/bin:$(PATH)

PORTLIBS          =    $(DEVKITPRO)/portlibs/switch
LIBNX             =    $(DEVKITPRO)/libnx
LIBS              =    $(CUSTOM_LIBS) $(LIBNX) $(PORTLIBS)

ifeq ($(strip $(APP_TITLE)),)
    APP_TITLE     =    $(TARGET)
endif

ifeq ($(strip $(APP_AUTHOR)),)
    APP_AUTHOR    =    Unspecified
endif

ifeq ($(strip $(APP_VERSION)),)
    APP_VERSION   =    Unspecified
endif

ifneq ($(APP_TITLEID),)
    NACPFLAGS    +=    --titleid=$(strip $(APP_TITLEID))
endif

ifeq ($(strip $(APP_ICON)),)
    APP_ICON      =    $(LIBNX)/default_icon.jpg
endif

NROFLAGS          =    --icon=$(strip $(APP_ICON)) --nacp=$(strip $(NACP_TARGET))

ifneq ($(ROMFS),)
    NROFLAGS     +=    --romfsdir=$(strip $(ROMFS))
endif

# -----------------------------------------------

.SUFFIXES:

.PHONY: all libs clean mrproper

all: libs $(NX_TARGET)

libs:
    @for dir in $(CUSTOM_LIBS); do $(MAKE) --no-print-directory -C $$dir -f Makefile.nx; done

$(NX_TARGET): $(ELF_TARGET) $(NACP_TARGET)
    @echo " NRO " $@
    @mkdir -p $(dir $@)
    @elf2nro $< $@ $(NROFLAGS)
    @echo "Built" $(notdir $@)

$(ELF_TARGET): $(OFILES)
    @echo " LD  " $@
    @mkdir -p $(dir $@)
    @$(LD) $(ARCH) $(LDFLAGS) -Wl,-Map,$(BUILD)/$(TARGET)-nx.map $(LIB_FLAGS) $^ $(LINKS) -o $@
    @$(NM) -CSn $@ > $(BUILD)/$(TARGET)-nx.lst

$(BUILD)/%.c.nx.o: %.c
    @echo " CC  " $@
    @mkdir -p $(dir $@)
    @$(CC) -MMD -MP $(ARCH) $(FLAGS) $(CFLAGS) $(DEFINE_FLAGS) $(INCLUDE_FLAGS) -c $< -o $@

$(BUILD)/%.cpp.nx.o: %.cpp
    @echo " CXX " $@
    @mkdir -p $(dir $@)
    @$(CXX) -MMD -MP $(ARCH) $(FLAGS) $(CXXFLAGS) $(DEFINE_FLAGS) $(INCLUDE_FLAGS) -c $< -o $@

$(BUILD)/%.s.nx.o: %.s %.S
    @echo " AS  " $@
    @mkdir -p $(dir $@)
    @$(AS) -MMD -MP -x assembler-with-cpp $(ARCH) $(FLAGS) $(ASFLAGS) $(INCLUDE_FLAGS) -c $< -o $@

%.nacp:
    @echo " NACP" $@
    @mkdir -p $(dir $@)
    @nacptool --create "$(APP_TITLE)" "$(APP_AUTHOR)" "$(APP_VERSION)" $@ $(NACPFLAGS)

clean:
    @echo Cleaning...
    @rm -rf $(shell find $(BUILD) $(OUT) -name "*nx*") $(OUT)/*.nro $(OUT)/*.nacp

mrproper: clean
    @for dir in $(CUSTOM_LIBS); do $(MAKE) clean --no-print-directory -C $$dir -f Makefile.nx; done

pc:
    @:

-include $(DFILES)